Rotatable coaster



FIG. 1 is a top plan view of the rotatable coaster showing my design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a front perspective view thereof.

The ornamental design for a rotatable coaster, as shown and described.